and more time studying. >> reporter: he was quoted in a 2010 boxing magazine as saying, i don't have a single american friend, i don't understand them. an aunt says, tamerlan had become a devoted muslim who prayed five times a day. according to an anonymous u.s. official he said nothing was found. they said he went to russia for six months last year. his brother dzhokhar had a social media open. he posted, i'm a stress free kind of guy, this two days after the bombings. >> they put that shame on the entire ethnicity.